/Engine/Plugins/Animation/MLDeformer/MLDeformerFramework/Source/MLDeformerFrameworkEditor/Public/MLDeformerEditorModel.h
This is executed when the timeline has been scrubbed. Sometimes this is also executed without user interaction, but to update the same data when there was scrubbed.
virtual void OnTimeSliderScrubPositionChanged ( double NewScrubTime, bool bIsScrubbing )